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Not able to be counted on; Not performing expected duties.
UrbanDictionary.com's definiton of pippie is very unreliable, as each one of the six definitons gives a different meaning for the word.
by Rodney Basil April 10, 2004
undependable, irresponsible, untrustworthy
James : Andy has bailed again he is now on punishment
Nick : You know baldy he is unreliable
by yittybum June 29, 2011